Schweiss bi-fold hangar door seal design
The rubber seal Schweiss uses doesn't last. After 3 years, mine had succumbed to dun damage. Rather than buying another rubber seal from Schweiss, I ordered enough "Umbrella" fabric to make a 48' strip doubled loop and used 1" foam pipe insulators from Lowes to fill it.
It has lasted 10 years so far and is very rain and bug proof.